More than 4 billion people live in Asia. But not one of them lives in a country where people can get married regardless of their sexual orientation. LGBT rights supporters have long looked to liberal Taiwan to change that, and numerous recent developments signal that the country may step up.

Members of the lesbian, gay, bisexual and transgender (LGBT) community in this city expressed support to the passage of the Sexual Orientation and Gender Identity and Expression (Sogie) Bill, which is...